Syringe



Patented Jan; 16, 951

- UNITED STATES PATENT OFFICE SYRINGE Armure. smith, Los Angeles, Calif.

Application January 5,` 1948, Serial No. 548

posable type.

v The general object of my invention is to provide an improved disposable syringe wherein the medicinal contents are hermetically sealed and wherein they are readily placed in condition for use and wherein novel means is provided for permitting the operator to determine whether the needle has been inserted in a blood vessel prior to the injection of the medicinal contents.

A more specic object ofthe invention is to provide a syringe including anouter barrel and a novel inner sliding barrel with a plunger there- 1n.

A further object of the invention is to provide a syringe including a barrel and a sliding medicine containing ampule in the barrel which has means thereon permitting the operator to detect` whether the needle carried by the syringe has been inserted into a blood vessel and Wherei.

in such testing is free from any likelihood that air will be drawn into the syringe and later injected into the patient.

A further object of the invention is to provide a syringe including a-barreland an innerslid-v ing barrel which contains a medicinal preparation and a plunger and wherein means is carried on the first barrel for piercing a diaphragm carried by the sliding barrel.

A further object of the invention is to provide a novel barrel for a syringe.

Another further object of the invention is to provide a novel sliding ampule for a syringe barrel.

Other objects and advantages of my invention will be apparent from the following description taken in connection with the accompanying drawings, wherein:

Fig. 1 is a side elevation showing my improved disposable syringe;

Fig. 2 is a central, sectional view showing the syringe in normal position;

Fig. 3 is a view similar to Fig. 2 showing the parts after the syringe has been placed in condition for use;

Fig. 4 is a View similar to Fig. 3 with the parts in the position which they occupy when the test is being made as to whether the needle is in a blood vessel, and

Fig. 5 is a central, sectional view with the parts in elevation showing the syringe after its contents have been discharged.

y Referring to the drawing by reference characters, I have shown my invention as embodied in a syringe which is indicated generally 7at I0.

i claim. (criss-215) As shown the syringe includes an outer barrel II, an inner sliding barrel or ampule I2 and a plunger I3 which is movable in the ampule I2.

The barrel II includes a cylindrical body I Il,

having a finger engaging shoulder I5 thereon and having a forwardly extending reduced portion I 6 and a further reduced portion I'I in advance of the portion I6. Y

Within the outer end of the portion I6 and in the portion I'I Iarrange a front closure I8 which includes an outwardly tapered body portion I9 and a rounded tip 20. The inner Wall of the outer end of the portion I6 and the inner wall of the portion I'I are tapered toV correspond to the taper of the body portion I9 of the closure I8.

"Within the front closure I8 I provide a front recess 2l, a second recess 22, which has a beveled wall 23, and a third recess 24, which communi- Cates With a reduced axial recess 25. The recess 25 is separated by `a diaphragm 26 from an inner recess 21." I Y A hypodermic needle having a front end 28, a xed collar 29 and an inner end 30 sharpened at its tip 3l, extends through the diaphragm 26 and is disposed in the recess 2l. The collar 29 includes a central sleeve 29a and similar tapered ends 29b and 29c integral' with the sleeve. The end 29c normally is arranged in the recess 22.

When the collar 29 is moved towards the tip 20 the end 29 rides up the beveled wall 23 and thenpasses into the chamber 24 and it is held in this-position against outward movement. The chamber 24 is shown as slightly longer than otherwise necessary to accommodate the collar end 29, to allow the beveled edge 23to returnV to its normal position.

The sliding barrel or ampule I2 consists of a tubular body 40 which is cylindrical throughout and at its forward end is provided with a piston closure 4I. This closure 4I includes a cylindrical portion 42, tted within the front end of thel cylinder 40, and an enlarged portion 43 which has piston forming'beads 44 thereon. The member 42 includes inner and outer coaxial recesses 45 and 46, separated by a diaphragm 4l. The portion 43 is of greater diameter than the diameter of the tapered part of the portion I6.

The plunger I3 includes a cylindrical body 50 which has a finger engaging bead 5I thereon and is recessed as at 52 at its front end to receive the reduced portion 53 on a piston head 54, which has piston forming beads 55 thereon. The various parts of my syringe are preferably made of a good grade of rubber, plastic and/or glass.

A medicinal preparation 5B, which may include 3 wax and oil or liquid, is contained in the sliding ampule I2. l

In use the parts are normally positioned as shown in Fig. 2. The operator moves the collar 29 inwardly, causing the end 29c to move into the recess 34 and causing the tip 3| on the needle to pierce the diaphragm 41 to place the needle in communication with the drug 56 in the ampule I2. The operator then inserts the needle 28 in the patient .and withdraws the inner barrel :or ampule I2 to the position shown in Fig. 4 vso that a partial vacuum is created at 51 ahead of the piston forming beads 44. The sliding barrel I2, being movable in the outer barrel I I, is adapted to be` partially withdrawn after it has been advanced slightly within the outer 'barrel to tree the inner end 31 of the needle lfrom the piston closure diaphragm 41.

By observation it may be learned if any blood has been aspirated into the partial vacuum in the space v51, .the lblood being visible through the member I if the latter `is made .of transparent material. If blood is observed, ay fresh insertion is made.

When the insertion has been properly made the member .4G is released and it will .beautomatically drawn in by thepartial vacuum .or Inay be pushed forward if desired until the parts again assume the position :shown in Fig. 3. Thereupon the operator vgrasps the portion I5 with the fingers and pushes .on the head 5I with the thumb vto cause the plunger I3 toV move inwardly `'so that the lpis-ton 53 will -force the 4drug 5.6V into `and `through the needle 20 so that the injection may be thereby made.

The syringe lincludes a needle protecting cover 58 which .engages the barrel portion I5.

In applicants present application, Serial No.

.54.8, iled January .5, 1.948, the claim is directed to ythe outer barrel with a front 4.closure therein and the claim includes the sliding barrel forming ampule within `the vouter barrel and with the piston closure in the sliding .barrel at .its ,front end. The claim :also includes the piston .plunger within the sliding Vbarrel ,and having -fa -piston `head thereon.

In applicants copendingapplication SerialNo. 1551, iled .January 1.0., A1948, the vclaim is directed to the .piston stopper which is hollow and has .pierceable front yand rear closures therein, the iront closure acting vas .a plunger. and both closures being pierceable .by .the needle :o.f..a filling apparatus.

Applicants copending .application Serial No. 2.90.0, led- January 17 1.94.8, relates to a syringe wherein there is a barrel having a front member,- a recess and with a needle extending through the front member and recess and having a protuberant portion engageable in the recess and with the needle adapted to be advanced to its seated position by means of a protective cap carried upon the needle.

From the foregoing description it will be apparent that I have invented a novel syringe which canbe economically manufactured and which is highly eiiicient for its intended use.

Having thus described my invention, I claim:

A disposable syringe including an outer barrel having an integral finger engaging ange thereon and having a reduced front end, said barrel having afront closure therein, said iront closure being disposed in the reduced portion of the barrel' and having a recess, a needle slidable in the `recess, a sliding barrel forming ampule within said first barrel, said sliding barrel having a piston .closure a-t the :front rend thereof, said piston closure having inner and outer axial recesses with a diaphragm between said recesses, `said needle havin-g its inner end disposed Inorma ly adjacent to said piston closure diaphragm `,and being adapted to pierce said piston closure .diaphragm when the needle is moved inwardly, a piston vplunge-r within said Asliding barrel, vsaid pistonplung-er vincludinga body having a piston head on the inner end thereof, said piston head having a piston ring forming beads thereon, said sliding barrel being :movable in the outer bar-rel ,and being adapted to be partially Withdrawn from the outer barrel to free the inner end v0I the needle from the pistonA closure diaphragm, the pis-.ten headon `said plunger being movable in the sliding barrel to :force the lcontents there from.

ARTHUR E. SMITH.

REFERENCES CITED The `following references .are nf record in the le of this patent:

UN TED STATES PATENTS Number Name Date 1,495,924 Quayle May 27, 1924 1,681,324 .Cook Oct. -9, 1928 1,718,605 Smith u .June v25, 1929 1,929,247 Hein Oct. 3, 1933 2,368,432 Smith Jan. 30, v1945 FOREEGNy PATENTS Number Country Date 532,191 Germany Aug. 24,- 1931 

